borisyankov/DefinitelyTyped — pull request #3122 by tomtung (2014-11-12 01:25:27+00:00)
Title: TrackballControls should extend EventDispatcher (threejs)

Please see
https://github.com/mrdoob/three.js/blob/master/examples/js/controls/TrackballControls.js#L611

The prototype of THREE.TrackballControls is THREE.EventDispatcher.prototype.